Because she can dig down four cards, and exile them, and then you can cast them for free, so you'll normally see a land and some other cards, often one that's a meaningless Lightning Helix or Absorb, and then two strong effects like a big spell or dork
It has been almost two years since I got the sketch It was May 2015
Most creatures can only block a single attacking creature, unless a specific ability or effect says otherwise
The last Chopper , a blocker, protects your Leader or Characters and can, with 2 attached Don, lower the Power of an opponents Character by -3000
The quick answer is the sets that are about to rotate out of Standard tend to be the cheapest
Each one, at least from what we've seen, looks more like something produced by a printer that's run out of coloured ink, instead of a card that's been designed to be in monochrome